An exercise bike is a stationary bike that simulates bike riding. They can be found in every gym and many homes, and are a great way to sneak a little exercise in without having to go anywhere.
A typical swim spa uses a number of different methods of propulsion to provide the volume of water to swim against. These include propellers, jets and or paddle wheels in order to create a current so the person using the swim spa can swim without moving forward in the water. It is a great way to save space in your backyard, rather than installing a whole swimming pool. Swim spas can also be constructed inside the house, if space is a problem.